/*
 * Copyright (C) 2008 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.base;

import com.google.caliper.Benchmark;

import java.util.concurrent.TimeUnit;

/**
 * Simple benchmark: create, start, read. This does not currently report the most useful result
 * because it's ambiguous to what extent the stopwatch benchmark is being affected by GC.
 *
 * @author Kevin Bourrillion
 */
public class StopwatchBenchmark
{
    @Benchmark
    long stopwatch(int reps)
    {
        long total = 0;
        for (int i = 0; i < reps; i++)
        {
            Stopwatch s = Stopwatch.createStarted();
            // here is where you would do something
            total += s.elapsed(TimeUnit.NANOSECONDS);
        }
        return total;
    }

    @Benchmark
    long manual(int reps)
    {
        long total = 0;
        for (int i = 0; i < reps; i++)
        {
            long start = System.nanoTime();
            // here is where you would do something
            total += (System.nanoTime() - start);
        }
        return total;
    }
}
